Three day care employees were arrested for giving toddlers melatonin gummy bears before nap time, according to police.

Kristen Lauletta, 32, Jessica Heyse, 19, and Ashley Helfenbein, 25, were arrested and charged with two counts of battery and two counts of endangering the life of a child, according to Des Plaines Police Cmdr. Christopher Mierzwa.

Management at the Kiddie Junction in Des Plaines, Illinois, reported one teacher to the police, and an investigation found two others were also involved.

While the three employees said they didn’t think there was anything wrong with passing out the natural supplement to calm them down before nap time, parents were unaware their children were given the sleep-aid, police said.

Management at Kiddie Junction in Des Plaines, Illinois, alerted the police and three employees were arrested and charged with child endangerment and battery.

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Melatonin is a hormone naturally produced by the pineal gland in the brain. But neurologist Dr. Anna Ivanenko told the Chicago Tribune giving it to children without their parents’ consent is “very inappropriate and potentially dangerous.”

The state Department of Children and Family Services have also launched an investigation, and all parents have been notified by both the daycare center and police.